Implementing Task Modules for MS Teams with Yo Teams

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Implementing Task Modules for MS Teams with Yo Teams


Task modules enable us to implement modal popup experiences in MS Teams applications. In this article, we will create task modules in a custom Microsoft Teams app using Yo Teams.

Task Modules overview

Task modules help to implement popup in MS Teams applications. Inside the popup you can run any of the below:

  • Custom HTML and JavaScript code
  • Iframe based widgets
  • Adaptive cards

From the MS Teams' point of view, task modules can be considered as a tab inside a popup. The task modules can be invoked from any of the below:

  • Channel and personal tab: Any button or link can invoke a task module by opening a popup.
  • Bot: Button on cards sent from the bot can invoke a task module.
  • Deeplink: You can compose a deeplink to invoke a task module.


Install below to get started:

Install Yeoman, Gulp global command-line interface, and Typescript compiler globally using NPM.

npm install yo gulp-cli typescript --global

Install generator-teams globally using NPM.

npm install generator-teams --global

To install preview versions of the generator, run the below command.

npm install generator-teams@preview --global

Implement task modules with Yo Teams

We will generate a solution using Yo Teams.

  1. On the command prompt, type below command.

     yo teams
  2. Follow the wizard to set up the solution.

  3. On the command prompt, type code . to open the solution in Visual Studio Code.

Use the latest version of Teams manifest and SDK

Run the below command to ensure the project is using the latest version of Teams manifest and SDK.

npm i @microsoft/teams-js

Changes to manifest.json

Under the src\manifest folder, open the manifest.json file and make below changes:

  • Change the $schema property to
  • Change the manifestVersion property to 1.8.

Changes to gulp.config.js

Under the root folder, open the gulp.config.js file and make below changes:

Add the following to the SCHEMAS property.

    version: "1.7",
    schema: ""

Test the personal tab

Before customizing the tab, let us test it.

  1. From the command line, navigate to the root folder for the project and execute the below command:

     gulp ngrok-serve

  2. Open a browser and navigate to the ngrok URL displayed in the console.

  3. Update the URL in the browser to load the tab created from the scaffolding process.

  4. Now, let us try to load the tab in MS Teams. In the browser, navigate to

  5. Using the app bar navigation menu, select the More added apps button. Then select More apps.

  6. Select Upload a custom app > Upload for me or my teams.
  7. Upload the app package (a ZIP file) from the project’s ./package folder.

  8. Click Add.

  9. The app will be displayed in MS Teams as below:

Adaptive Cards

Adaptive Cards are a cross-product specification for various Microsoft products including Bots, Outlook, Teams, and Windows. An Adaptive Card is represented as a JSON object. The JSON string defines all the controls, text, and actions that the hosting application will use to render the card.

Below is a JSON example of an Adaptive Card that contains an input box and a single submit button:

    "$schema": "",
    "type": "AdaptiveCard",
    "version": "1.0",
    "body": [
        "type": "Container",
        "items": [
            "type": "TextBlock",
            "text": "YouTube Video Selector",
            "weight": "bolder",
            "size": "extraLarge"
        "type": "Container",
        "items": [
            "type": "TextBlock",
            "text": "Enter the ID of a YouTube video to show in the task module player.",
            "wrap": true
            "type": "Input.Text",
            "id": "youTubeVideoId",
            "value": ""
    "actions": [
        "type": "Action.Submit",
        "title": "Update"

Add above json content by creating a file at src\app\scripts\youTubePlayerTab\YouTubeSelectorCard.json.

Using Adaptive Cards in Microsoft Teams task modules

Once we have an Adaptive card ready, we will create a task module to display it and handle the submission action.

  1. Open the file src\app\scripts\youTubePlayerTab\YouTubePlayerTab.tsx.
  2. Add youTubeVideoId to the state.

     export interface IYouTubePlayerTabState extends ITeamsBaseComponentState {
         entityId?: string;
         name?: string;
         error?: string;
         youTubeVideoId?: string;
  3. Update the render method as below:

     public render() {
         return (
             <Provider theme={this.state.theme}>
                 <Flex column gap="gap.smaller">
                     <Header>Task Module Demo</Header>
                     <Text>YouTube Video ID:</Text>
                     <Input value={this.state.youTubeVideoId} disabled></Input>
                     <Button content="Change Video ID (AdaptiveCard)" onClick={this.onChangeVideoAdaptiveCard}></Button>
                     <Button content="Show Video" primary onClick={this.onShowVideo}></Button>
                     <Text content="(C) Copyright Contoso" size="smallest"></Text>
  4. Implement onChangeVideoAdaptiveCard method as below:

     private onChangeVideoAdaptiveCard = (event: React.MouseEvent<HTMLButtonElement>): void => {
         // load adaptive card
         const adaptiveCard: any = require("./YouTubeSelectorCard.json");
         // update card with current video ID
         adaptiveCard.body.forEach((container: any) => {
             if (container.type === "Container") {
                 container.items.forEach((item: any) => {
                     if ( && === "youTubeVideoId") {
                         item.value = this.state.youTubeVideoId;
         const taskModuleInfo = {
             title: "YouTube Video Selector",
             card: adaptiveCard,
             width: 350,
             height: 250
         const submitHandler = (err: string, result: any): void => {
             this.setState(Object.assign({}, this.state, {
                 youTubeVideoId: result.youTubeVideoId
         microsoftTeams.tasks.startTask(taskModuleInfo, submitHandler);
  5. Implement onShowVideo method as below:

     private onShowVideo = (event: React.MouseEvent<HTMLButtonElement>): void => {
         const taskModuleInfo = {
             title: "YouTube Player",
             url: this.appRoot() + `/youTubePlayerTab/player.html?vid=${this.state.youTubeVideoId}`,
             width: 1000,
             height: 700
  6. The helper appRoot() method is as below:

     private appRoot(): string {
         if (typeof window === "undefined") {
             return "https://{{HOSTNAME}}";
         } else {
             return window.location.protocol + "//" +;
  7. Add an HTML page src\app\web\youTubePlayerTab\player.html to solution to render the YouTube video.

     <!DOCTYPE html>
     <html lang="en">
             <title>YouTube Player Task Module</title>
                 #embed-container iframe {
                     position: absolute;
                     top: 0;
                     left: 0;
                     width: 95%;
                     height: 95%;
                     padding-left: 20px;
                     padding-right: 20px;
                     padding-top: 10px;
                     padding-bottom: 10px;
                     border-style: none;
             <div id="embed-container"></div>
                 function getUrlParameter(name) {
                     name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
                     var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
                     var results = regex.exec(;
                     return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
                 var element = document.createElement("iframe");
                 element.src = "" + getUrlParameter("vid");
                 element.width = "1000";
                 element.height = "700";
                 element.frameborder = "0";
                 element.allow = "autoplay; encrypted-media";
                 element.allowfullscreen = "";

Test the solution

On the command prompt, type below command.

gulp ngrok-serve

Deep links allows to trigger a task module invocation from outside of teams, or within teams from a conversation.

The format for a deep link is as follows:<APP_ID>?url=<TaskInfo.url>&height=<TaskInfo.height>&width=<TaskInfo.width>&title=<TaskInfo.title>
  • <APP_ID>: This is the ID of the custom Microsoft Teams app. This app ID, or GUID, can be found in the app’s manifest.json file. E.g. 95b167e0-1299-11eb-b75c-318abc0c444f.
  • <TaskInfo.*>: The additional properties in the query string of the URL map to specific properties on the taskInfo object covered in a previous section.


If your APP_ID is autogenerated from manifest.json, get it by unzipping the zip file (e.g. from the project’s ./package folder.

The URL to display the YouTube video is as follows, which is our <TaskInfo.url>:


The deep link for to launch the video player task module would be the following{{YOUR_NGROK_URL}}/youTubePlayerTab/player.html?vid=OhFsua8pjjA&height=700&width=1000&title=YouTube%20Player:%20My%20video%20title

Test out the deep link as follows:


Task modules enable us to implement modal popup experiences in MS Teams applications. Yo Teams helps to build task modules with ease.


Code Download

The code developed during this article can be found at:

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